package string;

/**
 *
 */
public class StringAndStringBuilderDemo {
    public static void main(String[] args) {
        String s = "12";
        StringBuilder builder = new StringBuilder("a");

        for (int i = 0; i <= 10000000; i++) {
            builder.append(i);
        }
        System.out.println(builder);
        System.out.println("结束");
    }
}
